Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
9. Make the room dark and 
use a perfectly white image- 
screen for micro-projection 
(§ 360). 
10. Use only the direct current 
arc light for micro-projection, 
unless compelled to use alter¬ 
nating current (§ 412). 
11. Use an ammeter and a 
variable rheostat or other bal¬ 
ancing device and be very 
careful about the wiring (fig. 2-3 
12. The arc lamp must have 
fine adjustment screws to enable 
one to keep the arc centered on 
the objective front (§ 362). 
13. Always use a water-cell 
in micro-projection with the arc 
lamp radiant (§ 364). 
14. Use a mechanical stage 
for serial sections (§ 366). 
15. Blacken the objective 
mounts, and all metal parts of 
the projection apparatus to 
avoid glare; make sure there 
are no shiny surfaces within the 
projection apparatus (§ 370- 
9. Do not try to project with 
the microscope in a room that 
cannot be properly darkened or 
with a dirty screen. 
10. Do not use alternating 
current if it is possible to obtain 
direct current. 
11. Do not neglect the am¬ 
meter and the variable rheostat 
when installing a projection 
12. Do not try to use an arc 
lamp without fine adjustments, 
otherwise the crater cannot be 
kept centered. 
13. Do not project with the 
arc lamp without using a water¬ 
cell to absorb the radiant heat. 
14. Do not try to show 
selected sections of a series 
without the help of a mechani¬ 
cal stage. 
15. Do not leave the objec¬ 
tive mounts with brilliant re¬ 
flecting surfaces to dazzle the 
eyes of the operator, and do not 
leave shiny surfaces within the 
apparatus to give cross lights 
and make the image dim.


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